diff --git a/toolchain/Dockerfile b/toolchain/Dockerfile
index 7e2070c..f98aae8 100644
--- a/toolchain/Dockerfile
+++ b/toolchain/Dockerfile
@@ -6,4 +6,5 @@ RUN apk --update add make binutils gcc && \
 
 ENV PATH "/opt/toolchain:$PATH"
 ENV MITTOS64 "true"
+ENV BUILDROOT "/opt/"
 WORKDIR /opt
diff --git a/toolchain/emul b/toolchain/emul
index e85193a..5932943 100755
--- a/toolchain/emul
+++ b/toolchain/emul
@@ -2,8 +2,8 @@
 
 if [ -z ${MITTOS64+x} ]; then >&2 echo "Unsupported environment! See README"; exit 1; fi
 
-iso=/opt/mittos64.iso
+iso=${BUILDROOT}mittos64.iso
 
-/opt/toolchain/mkiso
+${BUILDROOT}toolchain/mkiso
 
 qemu-system-x86_64 -s -S -cdrom ${iso} -curses
diff --git a/toolchain/gdb b/toolchain/gdb
index d16fc76..cc4fefe 100755
--- a/toolchain/gdb
+++ b/toolchain/gdb
@@ -2,4 +2,4 @@
 
 if [ -z ${MITTOS64+x} ]; then >&2 echo "Unsupported environment! See README"; exit 1; fi
 
-/usr/bin/gdb -q -x /opt/toolchain/gdbinit
+/usr/bin/gdb -q -x ${BUILDROOT}toolchain/gdbinit
diff --git a/toolchain/mkiso b/toolchain/mkiso
index c10b478..6c4e42f 100755
--- a/toolchain/mkiso
+++ b/toolchain/mkiso
@@ -2,8 +2,8 @@
 
 if [ -z ${MITTOS64+x} ]; then >&2 echo "Unsupported environment! See README"; exit 1; fi
 
-sysroot=/opt/sysroot
-iso=/opt/mittos64.iso
+sysroot=${BUILDROOT}sysroot
+iso=${BUILDROOT}mittos64.iso
 
 mkdir -p ${sysroot}